Answer for Preheating by Gas Cutting Torch

Here is the Answer for the previous Question 

Preheating by Gas cutting Torch (Oxy fuel Cutting Torch) is prohibited due to that

- Excess oxygen in the flame will carburise the material surface and   thereby reducing the material strength
- The surface hardness will be reduced
- May locally overheat and make depression on the material surface by removing the surface material due to gas pressure
- Control of preheat temperature is difficult
- The material surface may become oxidised and may produce weld defects ( Non-Metallic Inclusions such as Oxide Inclusions)

Please post your replies in the comments box below

Share